Jig for grinding purposes



May 1, 1923.

K. WILLIAMS JIG FOR GRINDING PURPOSES Filed June 13 1921 3 vSheets-Sheet l May '1, 1923.

K. WILLIAMS JIG FOR GRINDING PURPOSES Filed June 13, 1921 3 Sheets-Sheet 2 May 1, 1923.

K. WILLIAMS JIG'FOR GRINDING PURPOSES Filed June l5, 1921 5 SheetsTSheet WML may vational view of the jig Fig. 1. Fig. 6 is an Patented May l, 1923.

l 1,453,737 i UNITED STATESI PATENT OFFICE.

KEITH WILLIAMS, F CHICAGO, ILLINOIS, ASSIGNOR T0 i CRAZY, NEW YORK.

H. EINER, OF

Application led June 13;

To all whom t may concern v Be it known that I, KEITH VVILLIAMB, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Jigs for Grinding Purposes, of which, the following is a full, clear, concise, and exact description, refer-l ence being had to the accompanyingdrawingrs, forming a part of this specification.

his invention relates to improvements in jigs for grinding purposes. y

One object of the invention is to provide a jig peculiarly adapted for holding an elef' ment formed with a cylindrical surface to be ground true against an emery or other disc grinder to the end that the cylindrical sur? face ma be accurately finished with a minimum o effort may be accurately finishedl with a minimum of effort by even unskilled operators.

A more specific object of the invention is to provide a ji of the character indicated which is especia ly adapted for holding what are known as friction'shoes of that type found in the so-called Miner friction draft gears, one example of which is illustrated in OC7onnor Patent 1,220,264, dated March 27, 191

Other objects of they invention will more clearly appear from the description and claims hereinafter following. In thedrawings forming a part of this specicationyFig.` 1 is a top plan viewof a y jig showing my improvementsI embodied therein and illustrating lts position with' respect to an emery wheel of the disc type. Fig. 2 is an elevational view of the structure illustrated in Fig. 1. Fig. 3 is a vertical sectional view corresponding substantially to the line 3-3 of Fig. 1. Fig. 4 is an end ele' looking towardjthe left hand end as illustrated in Figs. 2 and 3.. Fi cis a vertical 'sectional view correspongiing substantially to the line 5-5 in enlarged horizontal sectional view corresponding substantially to the line 6-6 of Fig.-2. And Figure 7 is a View similar to Fig. (5f/and corresponding substantially to the line 7 7 of Fig. 2.

In carrying out my invention, I providea suitable base plate or member A'whch is adapted to be secured on a suitable standard orframe' or which may constitute a part thereof.' Said baseplate A is provided with 1921. SerialI No. 476,992.

' upstanding longitudinally extending parallel spaced ribs 10 -10 rabbeted on r upper adjacent corners as indicated at 11-11,

the rabbets being lined with suitable may chined hardened wear plates 1212. Hori- Yzontally Kslidably mounted within the uide ways formed by the lined or faced ra bets above of which are also preferably provided with finished steel wear plates 14--14 to facilitate the horizontal adjustments. The cross-head is held in operative position in the guides by cover plates 15--15 olted to the ribs 10-10.

The horizontal adjustment of the cross-head 13 is effected by any. suitable means as for instance the worm 16 which cooperates with a`suitable nut 17 secured to the underside of the cross-head 13 as shown in Fig. 3.V The end of the worm 16 is swivelled in a plate 18 secured tothe end of the rib 10. On its outer end, the worm 16 is provided'with a crank handle 19 j so that, by turning the worm, the position of the cross-head can be adjusted horizontally, or stated in another manner, radially with respect to the emery disc wheel 20 carried by the shaft 21.

On its upper side, the crosshead 13 is provided with a circular recess 121 in which is rotatably mounted a circular base or ange 22 formed integrally with what may be termed an upright base or support B. The circular flange 22 is held against accidental removal by a suitable annular retaining plate 23 bolted to the crosshead 13.

The post or support B is provided at the top thereof with al horizontally extending heavy tube-like section or sleeve 24 having a cylindrical opening 25 extending therethrough to accommodate a horizontally sliding or reciprocating bar or-plunger C. The rotating or oscillating movement of the post or support B is eii'ected by means of a lever 26 pivoted in a forked support 27 screwed into the top of the sleeve 24. The pivotal connection between the lever 26 and support 27 vis made by means `of a pin28 and elongated slot as best shown in F ig. 5 for the pur hereinafter described.

described, is a cross-head 13, the edges Said lever 26 is bent downwardly and the hanwhich extends downwardly vthrou h a suitable aperture provided ina latera enlargement 31 of the support B, the-lower end of said pin being tapered as indicated at 32`and adapted to enter into one of two openings 33-33 in the crosshead 13. A collar 34 is secured to the pin and between the collar and the top of the recess in the enlargement is an expansion spring 34 normally tend# ing to depress the pin 30 into the corresponding hole 33 below. When the pin 30 is in its lower or depressed position, it is evident that the post or support B is held against rotation but by lifting the handle 29 the pin 30 is withdrawn and the support B may be swung from the full line position shown in Fig. 1 to the dotted line position shown in the samefigure and vice versa.

The bar or plunger C is preferably of cylindrical form throughout the greater portion of its length and ,is provided on the top and bottom thereof with longitudinally eX- Atending key ways 35 and 36 into which eX- tend keys 37 and 38 respectively, the sleeve 24. In this manner the is prevented from rotation but free movement horizontally. 38 is preferably permanently fixed in position whereas the upper'key 37 is made removable and adjustably held by screws 39-39 as shown in Fig. 3. At its inner end, that is the end nearest the grinder, the plunger C is provided with a longitudinally adjustable collar 40 adapted to be held in carried by plunger C is allowed any position desired by a set screw 41. A

relatively heavy expansion spring 42 encircles the plunger between the collar 40 and the adjacent end of the sleeve 24 so that said spring normally tends to project the=plunger toward the grinder.

At itsy outer end. that is the right hand end as viewed in Fig. 3, the plunger C has mounted thereon a hollow cap or cup 43. Said cap 43 is adjustable axially of the plunger C by means of an adjusting screw 44 threaded into the plunger as shown in Fig. 3. A set-screw 45 may also be employed to hold the cap in its desired position on the plunger. The cap 43 is so adjusted on the plunger C that, when the latter is in position to forcibly but yieldingly press the article `being ground against the emery p wheel, there will be a slight clearance as indicated at` 46 between vthe adjacent parts of the sleeve 24 and cap 43.

Pivotally mounted on the sleeve 24 by E suitable screw post 47 is a lplunger. operating. lever 48., The lnlb of said lever, as best shown in Fig. 5, is provided with a dependent lug 49, adapted to engage with the upstanding portion of the sleeve 24 to limit the throw of the`lever 48 from its full line position to the dotted line position shown in Fig. 1. Pivotally connected to the lever 48 is one Y'end of a link 50 the opposite end of said link The lower key 4 being pivotally connected by a suitable screw post 51 to the cap 43. The pivotal connections of the link are so located'that. when the lever 48 is moved to the dotted line position shown in Fig. 4, the pivotal connection between the link and the lever 48 will pass slightly beyond the line connecting the screw posts 47 and 51 so that the lever 4,8, link 50, cap 43 and plunger C will automatically be held in their dotted line positionsshown in Fig. 1 against the action of the spring 42.

At its outer end, the plunger C is forked as indicated at 52-52 and pivotally mounted between said forks on a horizontally extending pivot pin 53 is a spindle D which projects above and 'below the plunger as clearly shown in Figure 3. l/Vith this arrangement, it is obvious that the spindle D` 1s adapted for oscillation in a vertical plane.

Oscillatably mounted on the spindle D is the chuck or clamping arrangement proper. Said clamping arrangement comprises a lower heavy clamping plate 54, an upper backing plate or block 55 and an .upper clamping plate 56. The lower clam ing plate 54 is provided with a bushing 5 to provide a suitable bearing over a sleeve nut 58 which is vertically adjustably threaded on the lower end 59 of the spindle D. The upper backing pla-te or support 55 is also provided with a suitable bushing 60 to provlde a suitable bearing on the upper end of 'the spindle D. The clamping plate 54 andbacking plate 55 are preferably integrally united by vertical1y=extending side flanges 61-61 and in this connection it will be understood that the clamping plate 54 and backing plate 55 may be made-in detachable sections suitably bolted together as by the bolts 62-62 shown in Fig. 2 in order to facilitate the insertion kof the bushings 57 and 60. Y j

In illustrating the use of my invention, I have shown a so-called Miner friction shoe indicated generally by. the reference E. Such shoe is formed on the outer side with a cylindrical surface 63 and on the inner sidewith also cylindrical surfaces 64-64, separated, however, -by an intermediate radially inwardly projecting wedge section 65. The lowerclamping plate v 54 is formed with a rounded edge 66 and with a projecting arcua'te shelf 67, the latter being preferably@ lined on the ltop thereof with two layers of leather facing 69 so that the lower endk of the shoe is adapted to rest on the 'leather as clearly shown in Fig. 3. The backing block 55 is formed with a curved outer face 70 forming a suitable backing for the inner side of the shoe E.

The upper clamping plate 56 is ofl substantially semi-circular form as best shown in Fig. 1 and is also preferably lined on its under side with layers of leather 72 to engage the upper edge of the shoe E. Said lili) as indicated by -a cylindrical thermore, should there be any inequalities clamping late 56 is vertically movable on a post 7 3 w ich is adjustably threaded into the backing plate 55. An expansion spring 74 is'interposed between the top of the backing plate and bottom of the clamping plate 56 thereby normally tending to elevate the clamping plate. To prevent oscillation of the clamping plate with respect to the backing vided with dependent flanges 7 5-75 as shown in Figs. 2 and 4, said flanges riding against the backing plate 55.

Eccentrically pivoted to a collar 76 onlthe post 73, as by means of the horizontally extending pins 77, is a forked cam lever 78- having the cam sections 79-79 adapted .to enga e the upper face of the clamping plate 56. -I'he collar 76 is slidable on the post 73 and interposed between said collar and a.

washer 80 on the top of the post is a spring 81. The lever 78 is provided at its free end with a suitable knob or hand grip 82. The capacity conformation of the camsection 79 are made such, that when the lever 78 is inthe horizontal position shown in the drawings, the

clamping plate 56 will be held in its lower position with su'fcient force to securely hold the shoe E in place. The .base plate A is provided with laterally extended flangeor shelf to which is secu'red a hardened strip of metal 86 forming a support or shelf for the lower rounded end of the spindle D.

The operation is as follows,-assuming a shoe E in position: The operator grasps the knob 82 and swings it back and forth about the vertical axis providedby the spindle` D thesmall arrows in Fig. 1. In this manner, itis evident that the face of the shoe E to be ground will be moved back and forth over the emery wheel and surface finish obtained'. Furin the surface of the shoe E in avertical direction, the shoe will automatically be adjusted about the horizontal pivotal mounting of the spindle D, it being understood that the plunger Cv is always being pressed outwardly under the action ofthe spring 42. Stated in anothermanner, a universal mounting of thechuck or clamping mechanism proper is provided, the same beingv under ,spring pressure so as to insure proper finishing of the surface to be ground. Assuming the surface of the shoe E to have been properly finished, the operator first throws the lever 48 from the full line to the dotted line-position shown in Fig. 1 in which osition the plunger C will be automatically eld in the retracted position as heretofore described. The operator then .lifts the lever handle 26-29 so as to disengage the pin30 and then swin the support B to the dotted line position s own in Fig. 1. The operator next lifts the lever `78 so as to swing the by depressing the lever plate 55,.the former may be proof the springs 74 and 81 and the.

camsection 79 about the fulcrum pins 77, thereby releasing the upper clamping plate 56 and allowing the shoe to fall out freely.

Another shoe is next clamped into position 8 to horizontal position and the reverse procedure followed until the parts are returned to the full line l position shown in Fig. 1.

In -the arrangement shown, unskilled labor may be employed in grinding the surfaces of the shoes and the truing is obtained substantially automatically and at comparatively high speed. All manipulations re utmost simplicity.

I have herein shown and des ibed what I now consider the preferred ma ner of carrying out the invention, but the same is merely illustrative and I contemplate all changes and modifications that come within the scope of the claims appended hereto.

I claim: 1. In a jig -of the character described, the

uired of the' operator are of the 'l combination with clamping plates, one relatively axially movable toward `the other;

of a spindle on which said plates are mounted; a slidable plunger on which said spindle is swiveled to freely oscillate about an axis at right angles to the axis of the spindle; and a support on which said plunger mounted, said support being rotatable about an axis perpendicular 5to the line of sliding` movement of the plunger.

2. In a jig of the character described, the combination with a base member; of a support rotatably mounted on said base mem-- reciprocatingly mounted on said f ber; a bar support; and a pair of clamping plates uni-l bar. 3. In a jig is slidably'v loo vversally adjustably freely swiveled on said 105 of the character described, the

combination with a support; of a bar'ex` tending horizontally therefrom; a spindle pivotally mounted on said bar tofreely oscillate aboutan axis at right angles to the spindle; a pair of clamping plates oscillatably mounted on said spindle, one of said clamping plates being adjustable toward and from the other; and means for oscillating said plates about said spindle.

4. In a jig of the character described, the combination with a support; of a-bar extending horizontally from said support and slidable horizontally thereon; a spindle pivotally mounted on said bar to oscillate aboutV iis a horizontal axis; clamping means oscillata- Y said spindle; and yieldablel ably mounted on between said bar and said means interposed support, normally acting toforce in a direction toward the spindle.

5. In a jgfof the character described, the combination with' a support; of ai bar horizontally slidably mounted on said support; spring means interposed between said bar and support normally acting to. project said.`

said bar i clamping plate bar in one direction; and chilcking means universally adjustably mounted on the end of said bar.

6. In a jig of the character described, the combinationwith a carrier; of a clamping plate fixed to said carrier; a co-acting slidably mounted on said carrier for movement tow-ard and from the fixed plate; yielding means normally tending to move one of said plates away from the other; and means for moving the same toward the other and locking it in position, said means including a cam.

7. In a jig of the character described, the combination with a pair of clamping plates one relatively movable toward and from the other; of a member on which said clamping plates are carried; yielding means normally tending to move one of said plates away from the other; and means for moving said plate toward the other and locking 1t in position, said means including a' cam lever and a spring over-balancing said yielding means.

8.' In a jig of the character described, the combination with a pair of clamping plates one relatively movable toward and from the other; of a spindle on which said clamping plates are oscillatably mounted; spring means normally tending to move one of said plates away from the other axially of the spindle; and means for moving said plate toward the other and locking it in position, said last named means including an operating lever, said lever being also operatively connected to said plates, for oscillating the same.

9. In a jig of the character described, the combination with .a pair of clampin plates one relatively movable toward and from the other; of a spindle on which said clamping plates are oscillatably mounted; spring means normally tending to move one of said plates'away -from the other axially of the spindle; and means for moving said plate toward the other and vlocking it in position, said means including a cam lever nd a yieldingly controlled fulcrum there- 10. In a chuck of the character described, the combination with a lower clamping ing plate and rigi with respect thereto; an upper clamping plate movable toward 4and from said bottom clamping plate; and yieldable locking means for retaining said npper clamping plate in operative position.

plate; of a backingdplate above said clamp- In a jig of the character described,

the combination with a yieldingly controlled horizontally slidable bar; of a spindle pivotally mounted on said bar to oscillate about an axis; and upper and lower clamping plates oscillatably mounted on said spindle.

12. In a jig of the character descrlbed, the combination with a base plate; of a. crosshead adjus'tably mounted on said base plate; a support rotatably mounted on said crosshead; a spring influenced bar slidably mounted on said support; means for retracting said bar and holding it in retracted position against the inuence of the sprlng; a spindle pivotally mounted on the end of said bar; and clamping means carried by said spindle.

13. In a jig of the character described, the combination with a base plate; of a crosshead adjustably mounted on said base plate; a support rotatably mounted on said crosshead; a spring influenced bar slidably mounted on said support; means for retracting said bar and holding it in retracted position against the influence of the spring; a spindle pivotally mounted on the end of said bar; and clamping means carried by said spindle, said means including a lower clamping plate, an intermediate backing plate, an upper clamping plate, a cam lever cooperable with said upper plate and a spring controlled fulcrum on which said lever is ivoted.

14.-. n ajig adapted to cooperate with a rotary grinding wheel; the combination with work holding means; of means for oscillating said work-holding means about an axis parallel to the face of the grinding wheel, said work-holdingmeans being also mounted to freely oscillate about an axis at right angles to said first named axis to permit automatic adjustment of the face of said work parallel to said grinding wheel.

15. In a jig of the;` character described; the combination with a support; of a bar reciprocatingly mounted on said support; a work-holding means -adjustably mounted on said bar; and means for reciprocating said bar, including a lever and a to gle link connection between said lever an bar.

In witness that I claim the foregoing I have hereunto subscribed my name this 4th day of June 1921. J

KEITH WILLIAMS. Witnesses:

CARRIE GAiLINe, ANN Bama.

A m. im- 

